Boat.



C. S. FROST. BOAT.

APPLIOATION FILED DEo.1o,19os.

933,426. Patented sept. 7, 1909.

2 SHEETS-SHEET 1.

@fue om SH01 unta' C. S. FROST.

BOAT;

APPLICATION FILED IJEo.1o,1908.

933,426. 1' Patented sem-7,1909 v l ZSHEBTS-SEEET 2.

@www m i y I I to which itappertains wave will be .25 construction and of 4a NITED sTATEsi-DATENT crimen.'

cYnUsfs; mostri, or CENTRAL LAKE, momenti. n

" BOAT.

l To all whom @lt-may concern:

Be it known that I CYRUsS. (FROST, a

citizen of the United States, residing at Ce'nf tral Lake, in the county of Antrim, State I 5 ofMichigan, have invented certain new-and useful Improvements in Boats; land I dohereby declare the following to be a full, clear, and exactdes'cription of the invention, such aswill enable others vskilled in the art to make and use'the same.

' This invention relates to the hulls of ships and boats and hasspecialv reference to ahull deslgned for high speed power launches.

15 One object of the invention is to provide a hull adapted especially for use in shallow water. i Another object of the invention is to provide a hull of such construction that the bow practically eliminated andthe resistance due to the formation of this wave done away with. With the above and other objects in View, the mvention consists,

in a boat of peculiar after fully described, illustrated in the accompanying drawings, and specifically set forth in the claims.

" In the accompanying drawings, like char- 30 vacters of reference indicate like partsfinl the several views. i

Figure 1 is aside elevation of a boat constructed in accordance with this invention.

Fig. 2is a bottom plan View thereof. Fig.`

'35 3 is a cross section on the line 3&3 of Fig. 1.

' Fig.r 4 is a similar cross section on the line 4.-'-4 of Fig. 1. Fig. 5 is a similar cross section on the line 5--5 of Fig. 1. Fig. 6 is a bow elevation of this boat.

The` section 3 3- is plane of division between the fore body and after body, and'this fore body is provided with sides 10 which are curved fromfthefor-v ward section 3 3 forward and'toward each.y 4'5` other. Thesesides are further-provlded with upward from' bottom edges/:11 which curve this forward sectionv sothat the sides terminate in a point at. the bow. lAbaft the forward section SSL-3 the sidesarein the form `of plane surfaces 12'having a straight bottem edge as indicated at 13. Throughout. '-thei'n'fentire length the ,sidesV tumble out {slig'ltilyLas clearly shown -in the various sec.-

tions and the bow elevation. The bottom of the boat is formed forward with a concaved and upwardly curving. portion as indicated radius v of the concaved until at the extreme r be made within the forni of the invention without departingfrom the novelform, as hereinin a flat surface. taken through they lstraight bottom edges, Vcaved at the4 bow and ina flat surface,

Specification ofrLetters Pate-nt; 1 Patented Septfn 1909d 4 Application filed Decemberfl, 1908.- Serial No. 466,865.

atl/,tz Abaft-the forward section this concavity continues toward the stern with the portion increasing after portion of the bottom as indicated at l5.the radius becomes vinfinity and the bottom consequently flat.

The greatest depth ofthe boat is at the forward section before referred to and from this point the sides of the boat taper gradually util the stern is reached where the boat has the least depth.

By extended experiment with a full sized model it has been found thata boat having its hull constructed in accordance with this that a considerable increase in speed is obtained with the same power.

Therehas thus been provided a simple and efficient' device of the characterdescribed and for the purpose specied It will be obviousl 'that minor changes may7 and construction material principles thereof. Itis not, therefore, desiredto confine the' invention to the exact form herein shownand described, but it is `wished to include all such as properly come within the scope of the appended v clalms.

Having thus described the invention, whaty 1. In the hulls of ships and boats, a fore' body providedwith curved sides the lower edges of which 0are curved Aupwardly to the bow and terminate in a'point'at the bow, an after body provided with flat sides having straight bottom edges, 'and a bottom con- 4caved at the bow and merging at the stern 2. In thehuns edges of which are curved upwardly tol the bow and terminate in a point at the bow, an 'after body provided with Hat sides having and a lbottom constern.

merging at the stern said bottom being of uniform width from the forwardsection'to the of ships and boats, a fore `body provided with curved sides the lower In .testimony whereof, I aiix my signa-v ture, 1n presence of two witnesses.

d' ntnus s. FROST. lVitnesSes: 'I

' f HARRY OLMs'rEAD,

THos. D. MEGcIsoN.

70 invention 'practically has no bow waves and 

